Cryptocurrency Android Wallet

This is an initial idea of an Android Cryptocurrency Wallet Application. I need a very usable, simple yet modern design. A crypto currency wallet where users can buy bitcoin, bitcoin cash and ethereum (with the possibility to add more croptocurrency in future like litecoin or Ripple) with Indian Rupees by doing a transaction with a bank (like HDFC, KOTAK, ICICI etc...) and wallet like paytm/mobikwik. The app should have a user registration section, phone number verification option and an option to perform KYC (Know Your Customer) check for registered users (users should be able to upload files). The app should have an admin section to send email/messages/notification to the users, ban/un-ban users and a few others (will be added in future). Security should be the TOP priority in the app as the cryptocurrency wallet will store all the cryptocurrency of users and the private keys related to the crypto wallets should be stored in a very secured manner. The app will basically have 2 sections – 1 for storing the funds in INR form and 2 for storing cryptocurrency. And the cryptocurrency section will in turn will have 3 wallets – BTC, BCC and ETH. The flow of app will be like this (not finalised) – 1. User registers with email/phone and password – adds his bank account and KYC documents. 2. User logs into the app using user id/password or fingerprint. 3. User will add funds into the wallet using any Indian bank or wallet like paytm. 4. User will buy cryptocurrency with those added funds. 5. User can also sell cryptocurrency and will get rupees in return. 6. The money got from selling the cryptocurrency will remain as funds in user’s account and can also be deposited into the user's bank account. 7. All the cryptocurrency buy/sell rates should be in sync with the international market or can also be modified by the admin. Example of this type of app is ZebPay.